Stepper motors are commonly used in open-loop control systems due to their ease of operation and cost-effectiveness. However, despite their widespread use, they cannot function like standard AC or DC motors under normal conditions. The motor's running speed must be within the theoretical limit starting frequency for it to operate properly and reach the desired speed. If the required operating speed exceeds this limit, the motor may fail to start or experience "lost steps," leading to inaccurate positioning.
At the end of a movement, a stop pulse is typically issued to halt the motor immediately. In reality, however, the motor may only achieve a low starting frequency, which is insufficient for higher-speed operations. If the motor is forced to start at a speed above its maximum allowable starting frequency, it may lose steps or fail to respond entirely. Additionally, when the motor reaches the endpoint, even if the pulse is stopped right away, inertia can cause overshooting, meaning the motor moves past the intended position.
It’s important to note that to ensure accurate positioning—especially when the motor moves slowly to avoid "lost steps" or "overshoot"—most modern systems divide the positioning process into two stages: coarse positioning and fine positioning. This approach helps improve both accuracy and efficiency.
Common causes of inaccurate positioning include:
1. Starting the motor at a speed too high for its limit starting frequency, or accelerating too quickly, which can lead to "lost steps."
2. Insufficient motor power to meet system requirements.
3. External interference affecting the actuator's performance.
4. Malfunctions in the control system's controller.
5. Pulse loss during commutation, resulting in inaccuracies, especially with increased commutation frequency.
6. Design flaws in the software controlling the system.
7. Overcompensation or under-compensation in timing belt systems.
These issues significantly impact the reliability and precision of stepper motor applications. Proper design, tuning, and system configuration are essential to minimize errors and ensure smooth, accurate operation.
Car Battery Test Pen ,Car Battery Tester ,Digital Circuit Test ,Electric Circuit Test
YINTE TOOLS (NINGBO) CO., LTD , https://www.yinte-tools.com